/* The MIT License Copyright (c) 2009 Sadiq Jaffer Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ import java.io.IOException; import java.io.PrintWriter; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.Collection; import java.util.HashMap; import java.util.Map; import java.util.Map.Entry; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TrivialManagerServlet extends HttpServlet { Class mInterface; Map mInterfaceMethods; T mObject; public TrivialManagerServlet(Class pInterface, T pObject) { mObject = pObject; mInterface = pInterface; Method[] methods = mInterface.getMethods(); mInterfaceMethods = new HashMap(methods.length); for (int c = 0; c < methods.length; c++) { Method method = methods[c]; mInterfaceMethods.put(method.getName(), method); } } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("Trivial Manager"); if (req.getParameter("action") == null) { for (Method method : mInterfaceMethods.values()) { Class returnType = method.getReturnType(); Class[] parameterTypes = method.getParameterTypes(); out.println("
"); out.println(""); out.println(returnType.getSimpleName() + " " + method.getName() + "("); for (int v = 0; v < parameterTypes.length; v++) { Class parameter = parameterTypes[v]; out.println(parameter.getSimpleName() + ":"); } out.println(")  
"); out.println("


"); } } else if (req.getParameter("action").equals("exec")) { Method method = mInterfaceMethods.get(req.getParameter("method")); if (method != null) { Class returnType = method.getReturnType(); Class[] parameterTypes = method.getParameterTypes(); Object[] args = new Object[parameterTypes.length]; try { for (int c = 0; c < parameterTypes.length; c++) { String parameterStr = req.getParameter(Integer.toString(c)); Class parameter = parameterTypes[c]; if (parameter == Integer.TYPE) { args[c] = Integer.parseInt(parameterStr); } else if (parameter == Double.TYPE) { args[c] = Double.parseDouble(parameterStr); } else if (parameter == String.class) { System.out.println("Adding string.."); args[c] = parameter.toString(); } } try { Object outObj = method.invoke(mObject, args); if (returnType == Collection.class) { Collection collection = (Collection)outObj; out.println(""); for( Object obj : collection ) { out.println(""); } out.println("
" + obj + "
"); } else if( returnType == Map.class ) { Map map = (Map)outObj; out.println(""); for( Entry entry : map.entrySet() ) { out.println(""); } out.println("
" + entry.getKey() + "" + entry.getValue() + "
"); } else { out.println("Result: " + outObj); } } catch (InvocationTargetException e) { Throwable exp = e.getCause(); out.println("Error: " + exp + "

");
						exp.printStackTrace(out);
						out.println("
"); } catch (Exception e) { out.println("Error: " + e + "

");
						e.printStackTrace(out);
						out.println("
"); } } catch (NumberFormatException e) { out.println("Number failed parsing."); } } } out.println(""); } }